2889981 has 6 divisors (see below), whose sum is σ = 4174430. Its totient is φ = 1926648.

The previous prime is 2889979. The next prime is 2890001. The reversal of 2889981 is 1899882.

It can be written as a sum of positive squares in only one way, i.e., 2340900 + 549081 = 1530^2 + 741^2 .

It is not a de Polignac number, because 2889981 - 2¹ = 2889979 is a prime.

It is a super-2 number, since 2×2889981² = 16703980360722, which contains 22 as substring.

It is a Duffinian number.

2889981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2889181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 160546 + ... + 160563.

2^2889981 is an apocalyptic number.

It is an amenable number.

2889981 is a deficient number, since it is larger than the sum of its proper divisors (1284449).

2889981 is a wasteful number, since it uses less digits than its factorization.

2889981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321115 (or 321112 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 2889981 is about 1699.9944117555. The cubic root of 2889981 is about 142.4399007879.

Subtracting from 2889981 its reverse (1899882), we obtain a palindrome (990099).

It can be divided in two parts, 28 and 89981, that added together give a palindrome (90009).

The spelling of 2889981 in words is "two million, eight hundred eighty-nine thousand, nine hundred eighty-one".